Method for calculating target temperature split, target superheat, target enthalpy, and energy efficiency ratio improvements for air conditioners and heat pumps in cooling mode
US9207007B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Jan 24, 2013 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | May 16, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2500/19
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A method is described for distinguishing non-condensables from refrigerant over-charge, and refrigerant restrictions from refrigerant under-charge of a cooling system and calculating an amount of refrigerant to be added or removed to the cooling system for optimal performance. Expanded target temperature split and target superheat tables and delta superheat tolerances are provided based on laboratory data and mathematical algorithms. The methods may apply to Fixed Expansion Valve (FXV) and Thermostatic Expansion Valve (TXV) systems and may include making and displaying a diagnostic recommendation regarding non-condensables, refrigerant restrictions, or refrigerant adjustment based upon measurements of return-air wetbulb and drybulb temperatures, condenser entering air temperature, refrigerant suction line temperature, refrigerant liquid line temperature, refrigerant vapor and liquid line pressures, and refrigerant superheat and subcooling temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.